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Readonly specials and extra parameter attributes

X-seq: zsh-workers 49383
From: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
To: Zsh hackers list <zsh-workers@xxxxxxx>
Subject: Readonly specials and extra parameter attributes
Date: Mon, 6 Sep 2021 21:56:56 -0700
Archived-at: <https://zsh.org/workers/49383>
List-id: <zsh-workers.zsh.org>

This isn't allowed:

% typeset -F ARGC
typeset: ARGC: can't change type of a special parameter

But this is:

% typeset -Z3 '#'
% set -- Hello, my name is Bond, James Bond
% print $#
007
% typeset -u -R40 ZSH_EVAL_CONTEXT
% print $ZSH_EVAL_CONTEXT
                                TOPLEVEL
%

Most readonly-specials are arrays or hashes and ignore these
additional flags, but is this really meant to work for the scalars?

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